over a year ago:
charlotte, of course! she wants to be the best mermaid, the only one, and she's doing all the stuff on purpose. i mean, she knows very well that she's mean, but she doesn't care at all, she likes hurting people's feelings.
with rikki, that's a different story. she's just short-tempered, stubborn & sarcastic, but she doesn't have any bad intentions, she loves her friends very much and she is very funny.